Relieving-lathe.



. F. MULLER. Rgusvmc L'MHE. APPLICATION min mm2?. 1,911.

'Patented Apr. 1

4 SHEETS-SHEET l.

...Einw

@WWE

INVENTOR F. MULLER.

RELIEVlNG LATHE.

APPLICATION FILED 4l/1.N.27. 15H7.

Patented Apr. 1,1919.

4 SHEETS-SHEET 2.

R O T N E V W F. MULLER.

RELxEvxNG LMHE. AWLICATlON FILED 5151.27. 1911.

Patented Apr. 1,*1799.

EV TAL. lw

e leiner 7 frlmzmimon nennen., or merecen, solennemente, nssxencn ire BRETT e murrine COMPANY, 0F HARTFORD, CONNECTICUT, A CORPORATION OF NEW JERSEY.

Renewed-Lerne.

M ltzgggga Specification of Letters Patent. PNQHQQ kpn l? s, .7, v i ppicetion filed January 27, i917. Serial Ne. 144.924.

i all. whom it moy concern ing shown in elevation und others in vertical' ,Beit known that l, Fninnnnrcii llllLLnn,

citizen of the llnited States, residing et .,@Hertferi in the county ol Hertford and e.,.l-:itfite'of Connecticut, have invented Certainv .go-.L '.new end useful Improvements in Relievings Lathesgofwhioh the `followingr is e speeiicw `gdlion. Y

i rIlhe invention relates iiarticnlarly to lathes lqffor relieving Counterlco-res and other rotary ,1 Lrg; metalworking cutters requiring endwise rei l ie) However, the machine is not limited.' for i se upon cutters of the kind mentioned and` een bensed for practically all classes of Work 15reqniring longitudinal relieving movements f thecntting tool. rForthe sake of conven- J ienne the term cuttere2 is used throughout tiisspeeiliention, but it will be understood that the termis intended to include not only 20 rotary metal workingl tools but also :my o .otherarticles for wlxieliendwise relief is il'equiled.,

One Iof the objects of the invention is to i provide :in improved form of inonntineq for thetool carrying slide and the toilet/oc Another object of the invention is to proi idenn improved form of automatic feed .5 ing ineins whereby the cutting' tool een he `xindvnnred sov as toteke a fresh chip uponl30 ieach revolution ofthe cutter.

i i ',Otlror objects of the inventionwill he ap- ,.pjerenffrom the following Specification end .tliefclaims.. the accompanying drawings l' lieve r35,'sho'wn n ymachine similar in ineny respecte ,that shown in in e ,ending application 'r relieving le.tlies .Sezin No. 139,838, filed eceniloerO, 1916. A machine embodying ynmy.,present invention is much `simpler .than

40, tlietshown in the seid copending application i @and is therefore preferable when the :ironintantes are suoli .that it is only necessary to use the machine lor cutters requiring encl- 'ee relief., l i

The ronslrimlion `diown. in the drawings the one. which l now deem preferable. lint litgwill he understood lnt the drawings :md

f- .the ydescription :1ro intended to lie nwiel): illustrative end-nrenol. intonili'fd to denne or ijlimit the scope of the invention` tlieniirrmuimnyl'ing' claims 'lining relied :15mn lor that purpose.

Ofi the drawings.:

the worm wheeln :ire cons-triici'eddil section. l

2 is n plan View, Sonie of the perte being removed for the salie of clenrnessf.

Fig. 3 is en end View, teken from the left as viewed in. Figs. l and 2. i

Fig. is an end View tnkenroni the right es viewed in l enel 2, seine ofthe pelis helng shown .in section. i

Fig. 5 is n transverse vertical sectional View taken along' the lined-5 of Fig. f2.

Fig. 6 is :i transverse vertical sectional View teken nlong the line 6-i of Fig. 9..

Fig. 7 is si fragmentary sectional View teken along the line 7 of Fig. 2. i

Referring `to the drawings, l. represents the mein heee or hedfupcn which the other parts of the machine eremonnted. Means nre provided for holding; :1ndl rotating; av entter to he relieved, this ineens preferably romprising n lieedstock 2 ende teilstoelr 3, each, provided with e. center. lt will he under`- stood, however. that so for :is certain ieee tures ol" the invention are concerned l' do not limit myself to the particular construction shown, end tht the entier mayt if preferred, he otherwise held. as for instance hy n. clinch or collet. i

The hendstoclr is pro" dedwith n. frame eesting 4e rigidly secured to the bed. `This costing is provided with siii/'table hearings 5 and G in which there isrotflnhly mounted e. live spindle 7 which prefernlhly curi-ies o.

renter 8 .find :i linee plete Loosely 'mounted on the spindle 7 nre two worin wheels' l0 and ll. Preferably. as indica-ted in Fig. 2., the teeth of the Worm Wheel il@ nre adapted to mesh with n doubletlireeded worin.4 and the leei'xli of the worm. wheel il are adapted, tomesh with@ singletlireedod worm. Extending ti'nnsverselyo the hendsloclr and mounted in suitable henrings in .the rusting( 4. is n drireelnift 12 provided fdl-ts rear end with n.k driving ineens, here shownn the form of n. net of conc heit pulleys i3. Secured on the drive shaft l2. pr ably udjneenl the lwli" pulleys.A iS n. pinion lA whirli meshes wiili pinious i5 and lo mounted reepoetively on ndl'nbly inonn'ed transverse simile i7 und 1%. Moulded respectively on the shafts Ill" ond 13 :iro worms lll :ind Qllxwliieli n'iesh respectively with the :iloromid worm wheels iend ll. When dorwril wi l led `Willi the worm if) isi provi -ioo Mtl

double threadsA and the Worm 2O with a single thread. It will be seen that the construction is suoli that when the worms 19 Y and 20 are rotated the worm wheels will be given diderent rotative speeds, the wheel 10 in'this easajhaving a speed considerably in excess .of that of the wheel 11.

Splined to the spindle between the Worm wheels l0 and 1l is a clutch element 2l having teeth at each side adapted respectively to mesh with similar teeth formed on the worm wheels. Ity will heseen that by means of this clutch element either of the worm wheelsl can be Voperatively connected with the spindle. For moving the clutch element 21 longitudinally ofV the spindle, there is provided an oscillatory lever 22 provided with pins or projections 23, '23 tting in a circumferential groove in the clutch element. The lever 22 is secured to a transverse rock shaft 9,4 pro. vided with an operating lever 25. lt will be seen that by means of the lever the clutch element 2l can be controlled so as toloe maintained in neutral positiony as shown in Fig. l, or moved into engagement with either of the Worm Wheels 10 or 1].. The lever 25 is provided with a springpressed pin .l'adapted to enter suitable holes in the casting et and thus lock the lever and the clutch element in the desired position.

Mounted on the bed l for longitudinal movement is a tool carrying slide 27,- which will be referred to again hereinafter. The tailstoclt 3 is mounted on the bed in such a way as not to interfere in any way with the said slide 27.*" As shown in Fig. 4, the tailstock is carried by ways positioned at the sides ot the'slide, ythe arrangement being `such that the slide can move longitiulinally entirely independently oi the tailstock and that the tailstock can he adjusted longitudinally entirely in depemlently of the slide.

Because of the peculiar mounting ot the tailstoek it is not possible to make use of devices of the usual Isort -lor lockiii'g or elaun'iiugit in place. l provide devices at the sides of the tailstock, these devices loeing adapted loengage the hed and being preferably provided with means for simultaneously.actuating them, As shown, the two clanuiing devices are in the form et' levers 2S and 29 pivoted respectively to ears lormcd on the sides of the main tailstock casting. 'lhese levers are formed with in.-

' ner projections adapted to eugagedoww ward exposed inclined .surlaces` at. the sides of the bed. For forcing the 'two levers to ward each other into engagement with kthe hed, l provide a threaded rod 30 pi'voted at fil to theleven 2S and extending through an aperture in the leverll). A nut B2 engages thc rod, this nut preferably constitut` ing the hub ol a hand wheel 33. lmnp.;

posed between the nut or hub 32 and the ported that it. can be moved toward and thc aforesaid longitudinal movable slide, 27

lever 29 is a washer 34 having a horizontal projection adapted, to provide a rocking contact with the lever. Preferably a spring 35 emgaginer a collar I-lt isprovidcd t'or separating the two levers' when the nut or hub 3.2 isftnrned to permit such separation.

It will vhe seen that the construction dcscribed constitutes' a ditterential means for effecting simultaneous uniform clamping actions at both sides ot' the tailstock. Each lever serves as an abutment forthe application of pressure to the other.`

Asr concerns the other parts of .the tailstock, any usual or preferred construction 4can be used. l have shown a sliding sleeve I7adapted to be moved longitudinally un-V der the control of a screw 38 and a hand 'adjusting the center l1 by means` of the screw 38 and hand wheel 3S),.a cutter or other-'article to be relieved can be secured in the usual way between the two centers 8 and 41; and the cutter can be connected to the live spindle by means ofthe t'ace plate il to be rotated in the usual way.

As already stated, it may in some cases he preferable to mount the cut-ter entirely on the livespindle, and for this purpose a collet meeln'tnlsm .such as shown in Fig. 1 may lmprovigled.` The spindle 7 is hollow and A'rotatablymollnted therein is a sleevc'or bushing 42 controllable by a hand wheel 43.

The sleeve 42 has threaded engagement with ybe held and rotated independently ot the lailstock. A. rod45 adjustably mount-ed in HO the sleeve Ll2 serves as an alnrtment to limit the inward movement ot' the" cutter shank. When a center is used as shown, it can be monnted in the collet. lVhen the cutter is mounted entirely onV the live spindle` it is possible, it desired. to entirely remove the tailstoek. i

The cutting tool must. be` so held and supfromlthe cutter to be relieved iu timed rnlation to the rotation thereof. 'l`he lool must malte as many movements.,forward and backward during nach rotation as the eutterhas teeth. For supporting the lool is provided. As shown. the bed l is provided with rabbets in which the slide. Q7 lits. 'l`be slide is held in place by means ol gibs AConnected with the slidea27 for normaLJSc movement in unison therewith, is a device@` tionof the slide 27.

48 to which power is applied for actuating the slide. .Preferablythe device '48 is pro- `rvided on its lovver'side with a transverse slot having vertical parallel surfaces 49 extending at right angles to the lines of reciproca' Pivoted on the bed atv "50 is a lever 51 having two arms, one of i which vengages the actuating device 48 and the other of which is engaged by a suitable cam member 52. The cam member 52 is mounted on a vertical shaft 53, preferably being directly connected to a Worm wheel I' 54 also mounted on said shaft. The shaft isrotatable in suitable bearings formed in a y'housing 55 secured to the bed.

The cam member 52 .is provided in its top surfacevvlth a canrgroove 56 into Whlch fits 'i apin or roller on one arm of the leverl 51.`

The groove is preferably of the form shown 4r1in Fig. 2, being adapted to move the lever 1*slowly in one direction and rapidly inthe other.v `The lever 51 is adjustable so as to "vary the amount of movement which the 'cam transmits to the tool-carrying slide.

Preferably this adjustment is eiected lby changing theefectivelength o one arm of the lever, and asshown, this arm 'of the lever "isjconstructed with two 'telescopically engaging parts. At the sides of the` body part "of the lever are two slidable platesf57, 57

l formed 'with oppositely disposed thickened j notwithstanding any angular movement. The tvvo plates 57, 57 are secured to a block #portions 58, 58 Veach with a` surface in the i form of Aa section of a cylinder, these two `cylindrical surfaces having a common cen- "ter, The surfaces ofthe enlargements 58, "58 vfit between'. thev surfaces 49, 49` of the y'actuating device 48, and as the surfaces of the parts 58, 58 are cylindrical, the engagement with the surfaces 49, 49 is maintained 'which is centrally recessed to receive an rextension 60 on the body part of the lever. 4.in adjusting screwv 61 extends through an v'aperture in the block and is held against 'longitudinal n'iovement with respect thereto. The inner end of the screw extends into v"a threaded aperture in the said extension 60.

,The outer end of the screw is squared to receive a wrench and by turning the screw the yblock' 59 togetherv with the plates 57, 57 can 'i i @be moved so as to brin@ the" center of the cylindrical surfaces 58, v58 toward or away lfrom the pivotal centerof the lever. Pref- 'crahlyat the cxtreme inner positlon the ce for. ci." the cylindrical 'surfaces coincides vv'it kthe pivotal center, and no movementgof thb vactuating device or the slide takes place afl' the lever is oscillated. As the screw turned to move the ycenter of the cylindrlca, surtacesoutward. the movement of the actu-l ating device and slide is gradually started and this movement is increased as the eecfv tim length of the lever 1s increased. tIn

this Way the extent of movementy o'-the tool slide 'can-be varied :from zero to maximeans ofthe screw 62.'

As already stated, thecamvd'iisjfin the form of a groove, thus making it possible for the cam to positively move the leverv in `mum., The yscrew, 61 canfbe.clamped;l by

each direction, the construction being distinturn movement of the slide. By means ofi the spring I avoid excessive strain onthe lever,` the cam,"and the several power transmitting parts'. As illustrated, there is providedva lever 68 horizontally pivoted tothe bed 1 and at its upper end engaging a lugy I 64 depending from rthe actuatingdevice'48.

Pivotally connected tothe lower end of the lever 63-is a rod 65 kwhich extends through an aperture in a cross member 66 extending from one side to the other of the bed 1. A coil spring 67 surrounds the yrod, 66, one end ofthe spring abutting against the said cross membery and the other end being engaged by -a nut 68 on theffrodr` Bymeansfofvthefrod and the lever the force of thejspring is trims?` mitted to the actuating devices 48fand the tool carrying slide 27, tending to move these parts backward, thus assisting the ca1n in one direction. f

For rotating the camA member 52 and-the;-

Worm Wheel 54there -is provided' a worm, 69. The Wormis mountedon a transverse shaft 70 suitably mounted in thebed Aof the machine. Povver'to rotate ythe shaft 70 is transmitted from the aforesaid drive shaft 12 by means of a series of gears, thesev gearsy being interchangeable so. as to provide `for the driving of the shaft 70 at different speeds. c Asshown, theshaft 12 is provided at its forWardend-With a pinion 71 which meshesy with-a gear 72`mou'nted on a stud shaft 7 3.

,Rigi'dly vconnected with thegear72 is a pinion 74 which meshes With an idler gear 75 mounted on a stud 76 'whichis'slidable in a i'fackt 77 secured to the bed. This gear.v

l75 meshes with a second idler gear 7 8- which is mounted'on a stud 7 9vsecured to a bracket 80 mounted'for swin ing movement on thel shaft 70. Thisv brac et canv belockcd by means o'fja"'bolt 81. n withal gear' 7 9 on the shaft 70. x Itgwillbe seen vthat when the shaft 12 is rotatedfthe shaft 70 Will also be rotated butat a `greatly b v removing the gears 71, 72 and74:and

substituting other gears of different' diam,

eters. It will be noted that ythe idler-gears The'gear 78 meshesy reduced speed. If a 'different speed is required for the shaft 70, thiscan be obtained Q 75 and 7S are adjustable-so that proper meshing with the diii'erently diainetered gears iseii'ected. y 1 As hasaheady been stated, it is necessary VJfor the cutting tool to make vone. forward, and backward movement foreach. tooth of the cutter bc rehlieved; Itistherefore necessary. that foreach., revolution ofthe live spindle the .cam 5G be-.g'iven as many rota-` tions as the cutter has teeth.` ABy using gears l with the live. spindle, thus varying the speed of the spindle with respect, .to the lspeed of the drive shaft 1Q. Bynieans of this two-k spced worm and wheel driveincchanisinfor the spindle, I. am enabled to greatly increase the. range of the machine withoutl providing an unduly large inimber of interchangeable gears..

As already stated1 the cutting tool can, be mounted on the slide 27- in any Suitable manner. I -pret'ci' atool-liolding and supporting means` which lcomprises. a plate 82 secured to the. slide by means of bolts ,83. The slide is provided ...with a T-slott into which the boltst., thus making itpossible for the7 plate 82 to be .adjusted along the- Islide. and locked in adjusted. -position.l

Mounted on the plate-82 is a slide 8 5 mov'e adele at right angles to the slide 2"( and`V adapted to be" controlled by thescrew SAG and the` hand wheel 87.y Carried by the slide 85 are studs SS, 88, andasuitable toolclainp` holding a. tool 89 may .besecured ih place bycither of the. studs as required.

The actuating. device 4S" has lbeen described .as normally. movable in 'unison .with

98 and interposed between the `disk and the face of the worin wheel is a. washer 99 rotatably connected with the worm wheel by means of pins. Springs press the washer outwardagainst the disk` thus providing.

a frictional connection between the worin wheel and the shaft. The worin 97 is securedl to ashort horizontal shaft 100 mounted. in suitable bearings in a bracket 101 secured .to the bed. At one end of the shat is a bevel gear 102 which meshes with a bevel gear 103 on va horizontal longitudinal and loosely:mounted on the shaft, 10T is a ysleeve or bushing 110 provided with an arm the tool carrying slide27.' The two elements are connected by a rotatable screw 90 which has threaded engagement with an element 91 ot the slide 9.7.. The inner end of the Qscrew extends ,through an a erture in the actuating device 48 and is lied against-lone.4 gitudinal movement with .respect to the sit-1d "ed on the, bed is a short rotatableshaft 93 provided at its inner end with. afgrooved4 socket 94 which is shaped to enga e a. tongucdycollar 95 on the screw 90 an im#l part rotary movement thereto. It will be understood that the screw is longitudinally movable with respect to the shaft, 923, thus permitting the actuating device and the'. slide to reciprocate without.' ,howevencausing any reciprocation `of the screwactua-ting shaft93. l Y,

Feedingisj ell'cctod by` turningthe shaft 93, and this is preferably accomplished au` toiiiatically. Loosely mounted on the Shaft is a worm Wheel 96 with which meshes a Worin 97. Splined to the Sliaft93 is a disk.-

` si red extent..

111. Secured to the sleeve 110 is a second arm 112 which carries a lspring-pressed pawl 113` normally engaging the ratchet wheel108.

Pivotally connected at. one end with the arm 111 is a link 11,4 pivot-ally connected at its other end with a Llever 115. The lever 115- is secured to a. transverse shaft 11G mounted in suitable. bearings on the bed. Atthefother end of the shaft 116 is a, lever 11T-mounted at right angles to the lever 1.15. Pi'votally connected with the lever 117 is an upright.' link 11S the upper end of which has an adjustable pivotal connection y119 with a, bell-crank lever 19.0 horizontally pivotedv to the headstock casting. The pivot 119 can he adjusted toward or away from the pivot ot the lever, thus making it pos siblefor the lever as it isfrocked to transinit'movement to the link 118 to any de- 'Iheother arm of the bell- `crank lever 120 is provided with a projection `121 which engages a ycam member 122 secured to the spindle 7. A coil sprin 123 .surrounding the sha-ft 116 tends to roc the shaft and also the bell-crank lever 120 in the direction. to hold the projection 121 in engagement with the cam.' Thus the/ cem serves to niove the bell-crank and the connected parts in one direction and the spring serves to move them in the-other direction.

From the foregoing description it will be 4seen that as the/live s indle isrotei ed the helbcrank 120 is oscil ated andthe m0vement .thereof lis transmitted to a, greater or lesaextent to the arm 112 and the pawl 113.

1 The'. movement of the pawl in one direction .actuales the ratchet wheel 108, Whereaswhen moving in the, other direction the pawl moves freely over the tcethhofthe wheel;k Thus the' ratchet wheel is given gan"l intermittent movement, and through the mechanism de l pendently of the slide at both sides thereof,

` the.v tailstock.

by the tool holder canL I me A ation on cutters having a Wide range tool-holder to the same position which is occupied by the tailstock when a shorter cutter' is being operated upon.

It will be seen that the action of the machineY is entirely automatic after the preliminary adjustments have been made and after the cutter has been 'fut in place, and no harm can result even 'if the machine does not receive the undivided attention ofthe operator as the feeding is automatically stopped at the proper time, thus preventino any injury to the cutter.

Zwhat I claim is:

i. In a relieving lathe, the combination of a bed, a headstock provided with means for rotating a cutter, a slide mounted on the hed and longitudinally movable4 therealong, a tailstock mounted directly on vthe bed and adjustable therealong, the' tailstock engaging the bed independently of the slide and at both sides thereof, a tool holder mounted on the Slide and adjustable therealong. and

means -for moving the slidetoivrd and away from the cutter in timed relation to the rotation thereof.

2. In a relieving lathe, the combination of a bed, a headstockfprovided with means for rotating a cutter, -a slide longitudinally movable along the bed, a tool holder mounted on the slide and adjustable therealong, means for moving the slide toward and away from the cutter in timed relation to the rotation thereof, and .a tailstock positioned over the slide .and directly engaging the bed indethe said ta'ilstock being removable whereby the said tooliholder can be moved along' the slide to the position normally occupied by 3. In a relieving lathe, the combination of a bed, a headstock provided with means lfor rotating a cutter, a slide longitudinally movablealong the bed, a tool holder mounted on the slide and" adjustable therealong, means `for moving the slide toward and away 'from the 'cutter in timed relation `to the rotation thereof,` and a tailstook directly engaging the bed over and independently of the slide at both sides thereof and adjustable along' the bed, the tailstocl being' removable Wherebe moved along the slide to the the tailstock.

4a In a relieving lathe, the combination of a bed, a headstock provided with means for rotating a cutter, a slide" longitudinally movable along the bed, atool lholder mounted on the slide .and adjustable therealong, means for moving the slide toward and away from i the cutter'in timed relation to the rotation thereof, a tailstock carried by the bed on'` ways at thehsides of the slide, and means of y lengths. It will be obvious that for a relatively long cutter it is possible tol move. the 4 position normally occupied bv acti11gn,tl1e sides of thevt-ailstock adjacent the ways lfor locking it to the bed.

In a relieving lathe, the combination ot` ra hed, a headstock provided with means for rotating a cutter, a slide longitudinally movable along the bed, a tool holder mounted on the slide and adjustable therealong', means for moving the slide toward and away trom the cutter in timed relation to the rotation thereof, a tailstock carricdby the b ed O n we@ it the sides of the slide, devices position` i respectively at the sides of the tall- -stoclt adj arent the ways for locking it to the bed, and means for operatingr the said devices simultaneously.

In a relieving lathe, the. combination of a bed. ya headstock provided with meansI for rotatingaoutter, a-slidc longitudinally movable along the bed. a tool holder mounted on the slide and adjustable thercalong, meansl for moving the slide toward and awa)v from the cutter in timed relation to the rotatie thereof; a tailst'ock carried by the bed on ways at the sides of the slide`v devices positioned respectively at the sides of the tail` stock adjacent the ways for locking it to the bed. and difi'erential means for operating the said devices. v

7.111 a relieving` lathe. the combination of a bed` a lieadstoclt provided with means for rotatinga cutter. a slide longitudinally movable along' the bed` Ia tool holder mounted on the slide and adjustable therealong. means for moving the slide toward and away from the cutter in timed relation to the rotation thereof. a tailstoclt carried b v the bed on ways at the sides dif the slide, two clamping` devices pivoted to the respective sides of the 'tailstoeln land .a connecting de` vice for forcing` the said devices into en- ,tarement respectivelyT .with the sides of the 8. 'In a relieving lathe, the combination of a bed. a headstoek provided With means for rotating a cut-ter. a slide longitudinally movable along the b ed, a tool holder mounted on4 for moving` the slide toward and away Jfrom the cutter in timed relation 'to the rotation thereof. a tailstock carried by the ibed on Ways at the sides of the slide, tivo clamping devices pivoted to one of the said devices and extending through the other, and a nut on the rod for moving the said devices toward each other into clamping engagement with the bed. f

9. In a relieving` lathe, the combina-tion of a bed. a headstock provided with means for rotating' a cutter, a tailstock mounted di yrectly on the ybed and adjustable therealong.`

.a slide exten-ding under the tailstoclr and longitudinally movable independentl `thereof, a tool holder mounted on the slide and 'I l:u justable therealong, a slide actuating .de-

vice mounted independently of the bed and Annonce' tailetock 'in vways formed on the bottom of the' -slide, means engaging the slide and the actuating device `for relatively 4adjusting termittently operating the feeding device, and 'a manually controllable device supplef mental to the said automatic meansvfo'r pre- ,.fventlngthe engagement of the pawl. with the ratchet rWheel 'whereby the feeding' device lill direction. I

f l1. In a'relieving lathe,

is made'free foi' manual movement in either the combination e omeans for holding and rotating a cutter,

a tool holder. means holder toward vice vfor .giving the -tool holder al feeding movement supplementalto the aforesaid f normal movements, automatic means com* prisingga piiwl and a ratchet wheel and .ing the feeding device,

- determine( for moving the toolv and away from the cutter in v timed relation to the rotation thereof, a de frictionally engagingielements foi operata device for stopping device after movement to a preextent, meansv for disengaging the pawl from the ratchet wheel, and means for rendering the stopping device inoperative whereby the feeding device is made fi'ee for 'manual movement'indelinitely in either direction.. Y f

Y 12. In a relieving'latlie, the Combination the feedin of means for holding and rotating a cutter,"

a tool holder,- meansffor moving the tool holder toward and away from the cutter in 'timed relation tothe rotationthereof, a de.

vice for givingV the tool holder afeeding movement' supplemental to the laforesaid normal movements, automatic means c0mprisin al pawl and a ratchet wheel and frio tional y engaging elements for operating the.

feeding device,l a device for' stopping the "feeding device after movement to a prede= termined extent, and means for. disengag-` ing the pavvl from the ratchetwheel and for simltaneouely rendering 4 the stopping ,l de vice-#inoperative whereby the 'feeding 'device -is made free for manual movementinden 'nitely 1n either direction. y

yIn testimony whereof, I hereto affix my signature. f

Fnmnenion MLLER. 

